We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
AMO Forcing of Multidecadal Pacific ITCZ Variability.
- Authors
Levine, Aaron F. Z.; Frierson, Dargan M. W.; McPhaden, Michael J.
- Abstract
The Atlantic multidecadal oscillation (AMO) has been shown to play a major role in the multidecadal variability of the Northern Hemisphere, impacting temperature and precipitation, including intertropical convergence zone (ITCZ)-driven precipitation across Africa and South America. Studies into the location of the intertropical convergence zone have suggested that it resides in the warmer hemisphere, with the poleward branch of the Hadley cell acting to transport energy from the warmer hemisphere to the cooler one. Given the impact of the Atlantic multidecadal oscillation on Northern Hemisphere temperatures, we expect the Atlantic multidecadal oscillation to have an impact on the location of the intertropical convergence zone. We find that the positive phase of the Atlantic multidecadal oscillation warms the Northern Hemisphere, resulting in a northward shift of the intertropical convergence zone, which is evident in the Pacific climate proxy record. Using a coupled climate model, we further find that the shift in the intertropical convergence zone is consistent with the surface energy imbalance generated by the Atlantic multidecadal oscillation. In this model, the Pacific changes are driven in large part by the warming of the tropical Atlantic and not the extratropical Atlantic.
- Subjects
NORTHERN Hemisphere; ATLANTIC multidecadal oscillation; INTERTROPICAL convergence zone; PRECIPITATION variability; HADLEY cell
- Publication
Journal of Climate, 2018, Vol 31, Issue 14, p5749
- ISSN
0894-8755
- Publication type
Article
- DOI
10.1175/JCLI-D-17-0810.1